Chronometer made for British military operation Circa 1943

Brass deck chronometer by Ulysse Nardin
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Very fine Swiss brass deck chronometer made for British military operation, circa 1943. Ankerchronometer movement, Guillaume balance, fine adjusting device. Gilt dial with Roman hours and Arabic minutes, blued steel hands. Screwed brass case as well as a silver watch case, British military marking H.S.2 to the back. Dial and movement signed and numbered. Comes with extract from the archives and two part wooden box.
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Diameter: 56.5 mm
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Weight: 160 g
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Dimensions box: 9.5 × 12 × 6.5 cm
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Signed: Ulysse Nardin Locl Suisse
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Most of these deck chronometers were made with calibre 21 but this one was made with the top calibre 22 with 21 jewels and Guillaume balance.